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Titolo:
EFFECTS OF HIGH-DENSITY-LIPOPROTEINS ON INTRACELLULAR PH AND PROLIFERATION OF HUMAN VASCULAR ENDOTHELIAL-CELLS
Autore:
TAMAGAKI T; SAWADA S; IMAMURA H; TADA Y; YAMASAKI S; TORATANI A; SATO T; KOMATSU S; AKAMATSU N; YAMAGAMI M; KOBAYASHI K; KATO K; YAMAMOTO K; SHIRAI K; YAMADA K; HIGAKI T; NAKAGAWA K; TSUJI H; NAKAGAWA M;
Indirizzi:
KYOTO PREFECTURAL UNIV MED,DEPT MED 2 KYOTO 602 JAPAN
Titolo Testata:
Atherosclerosis
fascicolo: 1-2, volume: 123, anno: 1996,
pagine: 73 - 82
SICI:
0021-9150(1996)123:1-2<73:EOHOIP>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
NA+/H+ EXCHANGE; CHEMOTACTIC FACTORS; HUMAN-NEUTROPHILS; A-I; ACTIVATION; CALCIUM; THROMBIN; PHOSPHOLIPASE-A2; PURIFICATION; STIMULATION;
Keywords:
INTRACELLULAR PH; PROSTACYCLIN; HUMAN VASCULAR ENDOTHELIAL CELL; HDL; ATHEROSCLEROSIS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
T. Tamagaki et al., "EFFECTS OF HIGH-DENSITY-LIPOPROTEINS ON INTRACELLULAR PH AND PROLIFERATION OF HUMAN VASCULAR ENDOTHELIAL-CELLS", Atherosclerosis, 123(1-2), 1996, pp. 73-82

Abstract

We investigated the effects of high-density lipoprotein (HDL) on the intracellular pH ([pH](i)), and on the proliferation of human vascularendothelial cells (HUVEC), as well as on their production of prostacyclin (PGI(2)). The [pH](i) was slightly acidified when extracellular Ca2+ was chelated with EGTA. Pretreatment of HUVEC with amiloride, the Na+/H+ exchange inhibitor, caused the [pH](i) to become strongly acidic. The addition of HDL produced a biphasic shift in [pH](i), with a brief initial acidification followed by a rapid alkaline shift. The initial decrease in [pH](i) was abolished in the cells pretreated with EGTA, and subsequent alkalinization was inhibited. The alkalinization of [pH](i) disappeared in the cells pretreated with amiloride. These results suggest that [pH](i) depends mainly on Na+/H+ exchange and partially on the extracellular Ca2+ of the HUVEC either in the resting unstimulated state or during HDL stimulation. In contrast, the addition of LDL produced an acidification of [pH](i), which was increased by LDL inthe Ca2+ -free condition. In the cells pretreated with amiloride, [pH](i) was not further acidified by LDL. As a result, HDL promoted the proliferation of cells, an action that was inhibited by pretreatment with EGTA. However LDL inhibited cell proliferation, an action unaffected by EGTA pretreatment. The addition of HDL also enhanced the generation of prostacyclin in endothelial cells, the enhancement of PGI(2) generation resulted from an increase in the release of Ca2+ from storage sites, due not only to an increased production of inositol 1,4,5-trisphosphate (IP3), but also to the alkalinization of [pH](i). These effects may be involved in the mechanism of HDL's anti-atherosclerotic action.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/21 alle ore 10:08:31